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KVM: arm64: Enforce dependency on an ARMv8.4-aware toolchain

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With the NV support of TLBI-range operations, KVM makes use of
instructions that are only supported by binutils versions >= 2.30.

This breaks the build for very old toolchains.

Make KVM support conditional on having ARMv8.4 support in the
assembler, side-stepping the issue.

Fixes: 5d476ca57d ("KVM: arm64: nv: Add handling of range-based TLBI operations")
Reported-by: Viresh Kumar <viresh.kumar@linaro.org>
Suggested-by: Arnd Bergmann <arnd@linaro.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20240807115144.3237260-1-maz@kernel.org
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
This commit is contained in:
Marc Zyngier
2024-08-07 12:51:44 +01:00
committed by Oliver Upton
parent 7fef1eb0b0
commit 10f2ad032d
1 changed files with 1 additions and 0 deletions
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arch/arm64/kvm/Kconfig
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@@ -19,6 +19,7 @@ if VIRTUALIZATION
menuconfig KVM
bool "Kernel-based Virtual Machine (KVM) support"
depends on AS_HAS_ARMV8_4
select KVM_COMMON
select KVM_GENERIC_HARDWARE_ENABLING
select KVM_GENERIC_MMU_NOTIFIER